That all depends on where you look!
There are literally a ton of options for "Medium Scale" you just may not have as wide a variety of gauge selection.
However, really the only string that NEEDS to be medium scale is the E string, from there you can put on any Long Scale string really...
But you can get NPS Rounds / Stainless Rounds / Flats / Pressurewound / Half-Rounds. You will be fine! Enjoy that new bass!